You should see the example time series displayed with Cubism.
Send some events to the collector app via any means Cube supports (pointing toward the
collector's Heroku app URL) and they should start showing up.

Extras

Check out the aliases in .projectrc to get an idea for how to use this boilerplate locally.
In summary, just set a local MONGOLAB_URI variable locally and point it to something like
mongodb://localhost:27017/cube_development. Then use Heroku's foreman to start the apps.

Misc

Note that Heroku doesn't support websockets, so you'll need to use the HTTP endpoints if you deploy there.
If you need websockets, this issue talks about using heroku-cube with nodejitsu.